ML7396AB datasheet(55/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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●SFD detection function

ML7396 family supports the “Start Frame of Delimiter” (SFD) recognition function. By having 2 sets of SFD pattern strage

area, it is possible to detect IEEE 802.15.4g SFD patterns valied by “MRFSKFSD setting” and “FEC scheme”. For more

details, please refer to IEEE 802.15.4g standard.

Note: The default value of both SFD#1 and SFD#2 (Bank0 0x3A to 0x41) are set to the IEEE 802.15.4d SFD (1byte:0xA7).

n IEEE802.15.4g standard, 4 SFD pattern (each 2 bytes) is defined according to SFD group defined by phyMRFSKSFD and

FEC scheme (coded, uncoded).

According to the setting to MRFSKSFD ([PACKET_MODE_SET:B0 0x45(6)]) and FEC_EN ([FEC_CRC_SET:B0

0x46(6)]), SFD pattern to be added TX packet and SFD pattern to be received in RX packet are selected from SDF pattern #1

and SFD pattern #2 as following tables. SFD pattern #1 is defined by [SFD1_SET1:B0 0x3A] to [SFD1_SET4:B0 0x3D]

registers and SFD pattern #2 is defined by [SFD2_SET1:B0 0x3E] to [SFD2_SET4:B0 0x41] registers.

(1) TX

SFD length is shorter than or equal to 2 bytes. (IEEE 802.15.4g format)

MRFSKSFD

FEC_EN

SFD1[15:0]

SFD2[15:0]

SFD1[31:16]

SFD2[31:16]

SFD length is longer than or equal to 3 bytes. (Original format

MRFSKSFD

FEC_EN

0/1

SFD1 [31:0]

SFD2 [31:0]

(2) RX

If SFD length is shorter than or equal to 2 bytes and FEC_EN=0b1, it is possible to serach two SFD patterns. According to the

matching pattern, FEC is performed. Otherwise serach one pattern and the data following SFD are processed as uncoded.

SFD length shorter than or equal to 2bytes. (IEEE 802.15.4g format)

SFD pattern

FEC_EN

MRFSKSFD

uncoded

coded

SFD

detect

Data process after SFD

SFD1 [15:0]

SFD1 [31:16]

Uncoded

or coded

If pattern match with coded

pattern, FEC is performed.

If pattern match with uncoded

pattern, FEC is not performed

SFD2 [15:0]

SFD2 [31:16]

Uncoded

or coded

If pattern match with coded

pattern, FEC is performed.

If pattern match with uncoded

pattenr, FEC is not performed.

SFD1 [15:0]

Uncoded

Determined as uncoded

SFD2 [15:0]

Uncoded

Determined as uncoded

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